I dont know how to use the eye piece to get a view that i need. the scope is put together the end caps are off but nothing is coming into view through the yee piece

Your scope may not be hurt if water has not caused any rust yet. Things you will need, hair drier, Vaseline, large clear plastic bag, gas from a paint ball gun canister. Remove the eye piece, and shake as much water out as you can. Use the hair drier and heat the tube up, not too hot but warm, to dry the inside as good as you can, keep after it, shaking it and heating it. Once you feel all the water and moister are gone. Put a good amount of vaseline on the threads of the eye piece. The put the scope, the eye piece in the plastic bag. Use the paint ball gas and inflate the plastic bag, tie off the bag leaving room so you can screw the eye piece back on the main tube. Leave the scope in the bag for a few minutes before you do screw the eye piece on letting the gas fully get in the tube. The gas will give a bit of positive pressure inside the tube, Will displace any other air that will have moister in it. Keep the inside from fogging back up. The vaseline will help seal the gas inside. Hope this Helps Fix Ya up.

YOU MUST align the small finder scope with the main tube.

Point the scope at a distant object like the top of a telephone pole. GET the top in the center of the eyepiece in the main scope.

Then without moving the scope-- adjust the cross-hairs in the small finder scope so they line up on the same object.

You will need a good size clear plastic bag or a zip lock baggy or both, the zip lock needs to be large enough to put the scope in so you can close it up but still work on the scope. This will all make sense in a bit. You will need a good hair drier, and bit of vaseline. If you can get your hands on a tank of paint ball gun propellant (gas) all the better. Now heat the scope tube till warm then remove the eye piece you look through. heat this eye piece until you think all moisture is gone. Clean it as best as you can. Now put the scope and the eye piece in the bag, add a little vaseline to the threads be careful not to get any on the inside glass just on the threads. Put some of the gas in the bag to balloon it out and seal it up, but leave room so you can put the eye piece back on the scope tube. The gas should stay inside the scope tube and keep any moisture out. You are drying out and re-pressuring the scope. This will work even with out any gas but may only last 1-2 years or could last the rest of your life. Good Hunting.

The larger end is pointed UP, the diagonal and eyepiece go into the smaller end of the tube. Measure the hole, these come in .965, 1.25 and 2 inch sizes.

Many on line retailers sell these. Here is one retailer:

http://agenaastro.com/

a diagonal check the size of the hole:
http://agenaastro.com/optical-accessories/diagonals-prisms.html

there is one more piece that gos to the end you put your eye on it .if you take it of you will see it is just a mirror not the lens that you need.

You cannot use high power in those small telescopes. Only use the eyepiece with the largest number written on it.

I know the box said 600 power--- it was a complete LIE! The maximum magnification is 50 times aperture. You probably have something like a 2 inch lens. So 100 power is the maximum usable power.

Next time buy a telescope similar to this one:
http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=dobsonians/~product_id=08942

you dont say wich scope you have, by the looks of photo the objective housing screws off then way down inside you should see 3 screws wich hold it together...larry 5088331232

you can get some help from:

http://www.galileosplace.com/Instructions/FS-85DX_Instruction.pdf

Pictures of the exact item along with any markings would help a great deal. Even a hand drawn sketch along with dimensions would help.
It sounds as if you may be describing a scope cover. One end cap is clear and the other end cap either clear or has a yellow tint.

Most all current covers have the end caps attached to each other using two stretchable thin bungee like cords although some do have a one piece rubber holding the end caps.

If this is what you are looking for any sport shop, most discount stores and such carry them.

I attached a picture of this type of cover.

The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky.
So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.